ParticleGrl said:
You should only pursue a phd if you are fine with dedicating many years to your life, working hard, etc, and then ending up outside of science due to factors totally outside your control. Things like the funding climate, etc can have more impact on your career than anything you have control over.
I think this is quite correct. The advice in my (old) field - philosophy - on this matter is always this: if you cannot imagine being happy doing
anything else then pursue philosophy as a career. Otherwise, don't.
SHORT ADVICE: There is nothing wrong with, and much to be said for, going to uni for 3 or 4 years doing something you love until you're 21/22, surrounded by peers who share your passion, learning from experts, and getting an education, as opposed to a vocational training. But that is a lot different to 7 to 10 years of the above until you're 25/28.
LONG ADVICE: I did my undergraduate and my MA in philosophy with a single-minded determination to get a PhD in it and then a uni job. I knew the low chance of a permanent job, the low pay, the lost-earnings while studying, the total lack of respect from everyone outside the field etc. and didn't care.
By the time I finished my MA I was 27 and something happened: I suddenly realized that all that stuff that had driven me before was far less important. Now I cared much more about a stable, long-term relationship, getting on the property ladder, a pension, having disposable income etc. They will weigh much more heavily at the age you begin looking for work after your PhD than when you decide to start it.
Anecdotally, a woman I know did one undergraduate in business and went straight to work in business. She enjoys her job but probably does not identify with it as a 'marketing manager' the way you might as a 'scientist'. She was on £100 000 a year for a while. She took a job with a 50% pay cut so she could spend the time writing a novel. That 50% wage cut still meant she earned more than most workers in the UK. She is 33. And now back in a job paying £75 000.
Contra a friend who did his undergraduate and master's degree in literature and writing. He has written a novel and is trying to rewrite it after review to get it published. Writing is his identity and life. He earns £15 000 in a temporary job that he absolutely detests, and gets no benefits of any kind, and is, like all the temps there, subject to instant dismissal with no reason needed. He tells me daily he hates his life. The only thing that makes it more bearable is saying how 'ignorant' corporate types are and how he has not 'sold out' etc.
You judge which life you'd rather have.
So, although not quite feasible to earn lots, save, then take time out to 'do science', unlike writing a book, the point is - although I except this anecdote is likely to be a rarity: you can do a job that is quite enjoyable, even if it is not your calling, and still find time to pursue things you love. It's not either/or.